Vortilon an aerodynamic device

Have you ever heard the term “vortilon” in the field of aviation? You would have come across boundary layer energising devices. A vortilon is an aerodynamic device which is used to energise the boundary layer, delaying flow separation.

Image Credits: flickr.com/A380spotter

 

Where is a vortilon placed and how does it look?

A vortilon is a flat plate structure either one flat plate or a combination of two flat plates. This flat plate structure is placed in the underside of the airplane wing’s leading edge. In contrary to vortex generator the vortilon placement is aligned with the flow stream.

How does it work?

At low speeds there occurs span-wise flow, when vortilon are placed they create a vortex directed upwards. As the vortex is directed upwards it is streamed on the top surface of the wing thus making a contact with the surface and delaying the boundary layer separation. 

 

Additionally it energises the boundary layer thus delaying stall. Vortilon are more efficient at low speed flights.

Why are vortilon so rare?

In practical application vortilon are ineffective when used in straight wings. They can only be used in swept wings. Engine Pylons also act similar to vortilon which neglects the use of special devices.

Yet vortilons are used to overcome deep stalling.